rustlings/exercises/15_traits/traits1.rs
2024-04-17 23:34:27 +02:00

36 lines
782 B
Rust

// Time to implement some traits! Your task is to implement the trait
// `AppendBar` for the type `String`. The trait AppendBar has only one function,
// which appends "Bar" to any object implementing this trait.
trait AppendBar {
fn append_bar(self) -> Self;
}
impl AppendBar for String {
// TODO: Implement `AppendBar` for type `String`.
}
fn main() {
let s = String::from("Foo");
let s = s.append_bar();
println!("s: {}", s);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn is_foo_bar() {
assert_eq!(String::from("Foo").append_bar(), String::from("FooBar"));
}
#[test]
fn is_bar_bar() {
assert_eq!(
String::from("").append_bar().append_bar(),
String::from("BarBar")
);
}
}